Ask the Expert

Displaying a public IP address and domain name, but not internal data

We have an internal and an external domain, with internal and external IP addresses. My e-mail recipients see my internal domain name and my internal IP address for my mail server, which cannot be resolved by DNS to my public domain of blueridgepro.com.

How do I set my Microsoft Exchange Server box so the outside world sees my public IP address and domain name, but not my internal data?

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You could change the fully qualified domain name (FQDN) sent by Exchange Server from SMTP Virtual Server properties to match the public FQDN, but it isn't recommended and it isn't a complete solution -- the Message-ID will continue to have the actual FQDN.

Exchange Server does not have any native tools to rewrite SMTP headers. You may have to look into third-party tools like MailSweeper that do this, or code something yourself to run on your SMTP gateway.

Do you have comments on this Ask the Expert Q&A? Let us know.

Related information from SearchExchange.com:

  • Expert Advice: Obtaining secondary IP for an Exchange server
  • Learning Guide: How to fight spam on Exchange Server
  • Reference Center: DNS tips and resources
  • This was first published in March 2006

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